Organic light emitting display apparatus and driving method thereof

Abstract

An organic light emitting display apparatus, capable of removing motion blurring and preventing deterioration in brightness and an increase in power consumption, and a driving method thereof. The organic light emitting display apparatus includes: a plurality of pixels, each pixel including an organic light emitting device (OLED) and a pixel circuit; a data driver applying a data signal to a plurality of data lines connected to the pixels; a scan driver applying a selection signal to a plurality of selection scan lines connected to the pixels; a double speed timing generator doubling a frame frequency and applying a double speed frame signal to the scan driver; and a data signal converter doubling an input data signal, dividing one frame into two frames, applying a first data signal having a level higher than a level of the input data signal in one frame of the two frames, and applying a second data signal having a level lower than the level of the input data signal in the other frame of the two frames.

What is claimed is: 
     
       1. An organic light emitting display apparatus comprising:
 a plurality of pixels, each pixel including an organic light emitting device (OLED) and a pixel circuit, the pixel circuit comprising a switch coupled to the OLED to control an emission period of the OLED; 
 a data driver for inputting a data signal to a plurality of data lines connected to the pixels; 
 a scan driver for applying a selection signal to a plurality of selection scan lines connected to the pixels; 
 a double speed timing generator for doubling a frame frequency and for applying a double speed frame signal to the scan driver; 
 a data signal converter for doubling the input data signal, for dividing one frame into two sub-frames, for applying a first data signal having a level higher than a level of the input data signal during one sub-frame of the two sub-frames, and for applying a second data signal having a level lower than the level of the input data signal during the other sub-frame of the two sub-frames; and 
 an emission driver for applying an emission signal, which is applied to control the switch, to a plurality of emission scan lines, connected to the pixels, 
 wherein the selection scan lines comprise a first selection scan line and a second selection scan line, 
 wherein the pixel circuit comprises a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, and a driving transistor, 
 wherein the first switching transistor is configured to transfer a data voltage applied to the plurality of data lines in response to a first selection signal applied to the first selection scan line, 
 wherein the first capacitor is configured to store a voltage corresponding to a threshold voltage of the driving transistor, 
 wherein the second capacitor is configured to store a voltage corresponding to the transferred data voltage, 
 wherein the second switching transistor is configured to electrically connect a terminal of the first capacitor to a power supply line in response to a second selection signal applied to the second selection scan line, and 
 wherein the driving transistor is configured to supply a current from the power supply line to the organic light emitting device corresponding to the voltages stored in the first capacitor and the second capacitor. 
 
     
     
       2. The organic light emitting display apparatus of  claim 1 , wherein the double speed timing generator doubles the frame frequency to generate the double speed frame signal, and applies the double speed frame signal to the emission driver. 
     
     
       3. The organic light emitting display apparatus of  claim 1 , further comprising a data synchronization emission control signal generator generating an emission control signal synchronized with the input data signal and applying the emission control signal to the emission driver. 
     
     
       4. The organic light emitting display apparatus of  claim 1 , wherein a level difference between the first data signal and the input data signal is equal to a level difference between the second data signal and the input data signal. 
     
     
       5. An organic light emitting display apparatus comprising:
 a plurality of pixels, each pixel including an organic light emitting device (OLED) and a pixel circuit; 
 a data driver for inputting a data signal to a plurality of data lines connected to the pixels; 
 a scan driver for applying a selection signal to a plurality of selection scan lines connected to the pixels; 
 a double speed timing generator for doubling a frame frequency and for applying a double speed frame signal to the scan driver; and 
 a data signal converter for doubling the input data signal, for dividing one frame into two sub-frames, for applying a first data signal having a level higher than a level of the input data signal during one sub-frame of the two sub-frames, and for applying a second data signal having a level lower than the level of the input data signal during the other sub-frame of the two sub-frames, 
 wherein the selection scan lines comprise a first selection scan line and a second selection scan line, 
 wherein the pixel circuit comprises a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, and a driving transistor, 
 wherein the first switching transistor transfers a data voltage applied to the plurality of data lines in response to a first selection signal applied to the first selection scan line, 
 wherein the first capacitor stores a voltage corresponding to a threshold voltage of the driving transistor, 
 wherein the second capacitor stores a voltage corresponding to the transferred data voltage, 
 wherein the second switching transistor connects a terminal of the first capacitor to a power supply line, in response to a second selection signal applied to the second selection scan line, and 
 wherein the driving transistor supplies a current from the power supply line to the organic light emitting device, in correspondence to the voltages stored in the first capacitor and the second capacitor. 
 
     
     
       6. The organic light emitting display apparatus of  claim 5 , wherein the pixel circuit further comprises a third switching transistor diode-connecting the driving transistor in response to the second selection signal. 
     
     
       7. The organic light emitting display apparatus of  claim 5  wherein the pixel circuit further comprises a fourth switching transistor disconnecting the organic light emitting device from the driving transistor, in response to an emission signal applied to emission scan lines. 
     
     
       8. An organic light emitting display apparatus comprising:
 a plurality of pixels, each pixel comprising an organic light emitting device and a pixel circuit; 
 a data driver for inputting a data signal to a plurality of data lines connected to the pixels; 
 a scan driver for applying a selection signal to a plurality of selection scan lines connected to the pixels; 
 a double speed timing generator for doubling a frame frequency and for applying a double speed frame signal to the scan driver; and 
 a data signal converter for doubling the input data signal, for dividing a frame into two sub-frames, and for applying the input signal in a form of a triangular wave during the two sub-frames, 
 wherein the data signal converter is configured to apply a first signal gradually rising from a first level lower than a level of the input data signal to the level of the input data signal during a first sub-frame of the two sub-frames, and is configured to apply a second signal gradually falling from the level of the input data signal to a second level lower than the level of the input data signal during a second sub-frame of the two sub-frames. 
 
     
     
       9. The organic light emitting display apparatus of  claim 8 , wherein the first level is equal to the second level. 
     
     
       10. The organic light emitting display apparatus of  claim 8 , further comprising an emission driver applying an emission signal to a plurality of emission scan lines connected to the pixels. 
     
     
       11. The organic light emitting display apparatus of  claim 10 , wherein the double speed timing generator doubles the frame frequency to generate the double speed frame signal, and applies the double speed frame signal to the emission driver. 
     
     
       12. The organic light emitting display apparatus of  claim 10 , further comprising a data synchronization emission control signal generator generating an emission control signal synchronized with the input data signal and applying the emission control signal to the emission driver. 
     
     
       13. A driving method of an organic light emitting display apparatus comprising a scan driver for applying a selection signal to a plurality of selection scan lines connected to pixels including pixel circuits, and an emission driver for applying an emission signal that is configured to control a switch to a plurality of emission scan lines, the method comprising:
 doubling a frame frequency of signals applied to pixels of an organic light emitting display and dividing one frame into two sub-frames; and 
 applying a first data signal having a level higher than a level of an input data signal during one sub-frame of the two sub-frames and applying a second data signal having a level lower than the level of the input data signal during the other sub-frame of the two sub-frames, 
 wherein the selection scan lines comprise a first selection scan line and a second selection scan line, 
 wherein the pixel circuit comprises a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, and a driving transistor, 
 wherein the first switching transistor is configured to transfer a data voltage applied to a plurality of data lines in response to a first selection signal applied to the first selection scan line, 
 wherein the first capacitor is configured to store a voltage corresponding to a threshold voltage of the driving transistor, 
 wherein the second capacitor is configured to store a voltage corresponding to the transferred data voltage, 
 wherein the second switching transistor is configured to electrically connect a terminal of the first capacitor to a power supply line in response to a second selection signal applied to the second selection scan line, and 
 wherein the driving transistor is configured to supply a current from the power supply line to the organic light emitting device corresponding to the voltages stored in the first capacitor and the second capacitor. 
 
     
     
       14. The driving method of  claim 13 , wherein a level difference between the first data signal and the input data signal is equal to a level difference between the second data signal and the input data signal. 
     
     
       15. A driving method of an organic light emitting display apparatus comprising a scan driver for applying a selection signal to a plurality of selection scan lines connected to pixels including pixel circuits, and an emission driver for applying an emission signal that is configured to control a switch to a plurality of emission scan lines, the method comprising:
 doubling a frame frequency of signals applied to pixels of the organic light emitting display apparatus and dividing one frame into two sub-frames; and 
 applying a data signal during the two sub-frames, wherein the data signal gradually rising from a first level lower than a level of an input data signal to the level of the input data signal is applied during a first sub-frame of the two sub-frames, and the data signal gradually falling from the level of the input data signal level to a second level lower than the level of the input data signal is applied during a second sub-frame of the two sub-frames, 
 wherein the data signal is triangular, 
 wherein the selection scan lines comprise a first selection scan line and a second selection scan line, 
 wherein the pixel circuit comprises a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, and a driving transistor, 
 wherein the first switching transistor is configured to transfer a data voltage applied to a plurality of data lines in response to a first selection signal applied to the first selection scan line, 
 wherein the first capacitor is configured to store a voltage corresponding to a threshold voltage of the driving transistor, 
 wherein the second capacitor is configured to store a voltage corresponding to the transferred data voltage, 
 wherein the second switching transistor is configured to electrically connect a terminal of the first capacitor to a power supply line in response to a second selection signal applied to the second selection scan line, and 
 wherein the driving transistor is configured to supply a current from the power supply line to the organic light emitting device corresponding to the voltages stored in the first capacitor and the second capacitor. 
 
     
     
       16. The driving method of  claim 15 , wherein the first level is equal to the second level.